package com.niit.agricstore.filter;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.jsonwebtoken.ExpiredJwtException;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.web.filter.OncePerRequestFilter;


import java.io.IOException;

/**
 * 处理Controller抛出异常会被该过滤器处理
 */
public class ControllerExceptionFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        try {
            filterChain.doFilter(request, response);
        } catch (ExpiredJwtException e) {
            e.printStackTrace();
            response.setStatus(401);
            response.setContentType("application/json");
            response.setCharacterEncoding("utf-8");
            response.getWriter().print("token过期");
        }
    }

    public String convertObjectToJson(Object object) throws JsonProcessingException {
        if (object == null) {
            return null;
        }
        ObjectMapper mapper = new ObjectMapper();
        return mapper.writeValueAsString(object);
    }



}
